Brahman and Chhetri of Nepal - History and Cultural Relations

Brahmans are thought to have begun emigrating to the far western
Nepalese hills in the twelfth century after they were dislodged by
Muslim invasions in India. In the Nepal hills they encountered the Khas,
people of the same general background as the Brahmans, who nevertheless
ranked low in the caste order because of their deviance from orthodox
caste rules. Both the Khas and the progeny of unions of Brahman men and
Khas women, called Khatri, were granted the status of Chhetri. The
existence of Matwali Chhetris (those who drink liquor), who do not wear
the sacred thread, is evidence that not all Khas were accorded Chhetri
status.